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Condensed Income Statements (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue:        
Sales, net $ 4,935 $ 4,807 $ 28,015 $ 10,586
Rental income 14,120 12,672 41,529 35,153
Service and maintenance income 235 222 630 774
Total revenue 19,290 17,701 70,174 46,513
Operating costs and expenses:        
Cost of sales, exclusive of depreciation stated separately below 3,126 3,231 20,244 6,417
Cost of rentals, exclusive of depreciation stated separately below 5,896 5,622 17,279 14,893
Cost of service and maintenance, exclusive of depreciation stated separately below 88 92 279 323
Selling, general, and administrative expense 1,958 1,568 6,116 4,417
Depreciation and amortization 3,980 3,545 11,564 10,270
Total operating costs and expenses 15,048 14,058 55,482 36,320
Operating income 4,242 3,643 14,692 10,193
Other income (expense):        
Interest expense (8) (11) (13) (48)
Other income (expense) (37) (34) 62 719
Total other income (expense) (45) (45) 49 671
Income before provision for income taxes 4,197 3,598 14,741 10,864
Provision for income taxes 1,591 1,367 5,627 4,128
Net income $ 2,606 $ 2,231 $ 9,114 $ 6,736
Earnings per share:        
Basic (in USD per share) $ 0.21 $ 0.18 $ 0.75 $ 0.55
Diluted (in USD per share) $ 0.21 $ 0.18 $ 0.74 $ 0.55
Weighted average shares outstanding:        
Basic (in shares) 12,230 12,179 12,214 12,151
Diluted (in shares) 12,331 12,277 12,312 12,256